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server.go
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server.go
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package plex
import (
"context"
"errors"
"net"
"runtime"
"time"
"github.com/phogolabs/flaw"
"github.com/phogolabs/plex/grpc"
"github.com/phogolabs/plex/http"
"github.com/soheilhy/cmux"
"golang.org/x/sync/errgroup"
)
const (
// ErrClosedConn occurs when the connection is closed
ErrClosedConn = flaw.ErrorConstant("use of closed network connection")
)
// Server represents a server
type Server struct {
Addr string
Gateway *grpc.Gateway
Proxy *http.Proxy
}
// NewServer creates a new server
func NewServer() *Server {
server := &Server{
Addr: ":8080",
Gateway: grpc.NewGateway(),
Proxy: http.NewProxy(),
}
return server
}
// ListenAndServe listens on the TCP network address srv.Addr and then
// calls Serve to handle requests on incoming connections.
// Accepted connections are configured to enable TCP keep-alives.
func (srv *Server) ListenAndServe() error {
listener, err := net.Listen("tcp", srv.Addr)
if err != nil {
return err
}
return srv.Serve(listener)
}
// Serve accepts incoming connections on the Listener l, creating a
// new service goroutine for each.
func (srv *Server) Serve(listener net.Listener) (err error) {
sched := func() {
// schedule the routine
runtime.Gosched()
// wait for 500ms
time.Sleep(500 * time.Millisecond)
}
var (
mux = cmux.New(listener)
group = errgroup.Group{}
)
// boot the grpc server
group.Go(func() error { return srv.Gateway.Serve(mux) })
// we have to delay the start of the proxy to give time to the gateway to wake up
sched()
// boot the proxy
group.Go(func() error { return srv.Proxy.Serve(mux) })
// we have to delay the start of the server
sched()
// boot the multiplexer
group.Go(func() error { return mux.Serve() })
if err = group.Wait(); err != nil {
var errx *net.OpError
if errors.As(err, &errx) {
if errx.Err.Error() == ErrClosedConn.Error() {
err = nil
}
}
return err
}
return err
}
// Shutdown shutdowns the server
func (srv *Server) Shutdown(ctx context.Context) error {
if proxy := srv.Proxy; proxy != nil {
if err := proxy.Shutdown(ctx); err != nil {
return err
}
}
if gateway := srv.Gateway; gateway != nil {
if err := gateway.Shutdown(ctx); err != nil {
return err
}
}
return nil
}
// SetStatusCode sets the status code
var SetStatusCode = grpc.SetStatusCode